Abstract
An analysis is presented of the anomalous frequency shift and linewidth of Brillouin scattering in K2SeO4 near the normal-incommensurate phase transition at Ti=130 K. Fluctuations are included up to second order, which allows incorporation of the regime above Ti. Below Ti, terms to second order in the fluctuations and a bilinear part in the order parameter and the fluctuations each contribute significantly to the anomalies. Results for relaxation times and coupling parameters are compared with findings from other sources.
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